.; to produce type .; .; $ runoff filename .; .; output name is .mem .; .PAPER SIZE 58,77 .RM 77 .LM 0 .npr .ap .nhy .p 0,1 .nast .naj .k .sthl ,,,,,1,1 .c;XMM-OM/MSSL/NT/0004.01 .c;^&Notes on a Draft specification to ITL for manufacture of\& .c;^&a micro-channel plate intensifier for\& .c;^&the proposed Optical Monitor on XMM\& .c;J Fordham UCL and R Cole MSSL 5-Jan-89 .hl 1 Introduction The requirement is for a version of the dual,chevron,micro-channel plate intensifier, running in saturated mode, that has been developed by ITL for photon counting in optical astronomy. Initially, the requirement is for an intensifier with an ion-barrier film on the first channel plate. However, if the development of a non-filmed device proves to be successful then this could be considered for the qualification and flight models. .hl 1 SPECIFICATION The specifications on the intensifier are : .lit Field diameter 25mm Input Window Sapphire window giving useful sensitivity down to 1500A Photocathode S20 RQE >20% at 3000A Output Phosphor P20 Intensifier gain >7000000 at peak of pulse height distribution. Output pulse width 120 microns FWHM at peak of pulse width distribution Resolution ~30 microns at 3000A Counting efficiency >30% for ion-filmed device. Count rates maximum count rate of 1000 counts/pixel/sec on 80 micron square pixel size. Mass TBD Power TBDW at TBDV Lifetime 10 years continuous operations with allowable gain reductions Vibration specification TBD Operational Temperature Range TBD Survival Temperature Range TBD .eli .hl 1 Development Programme The development programme for the detectors for the Optical Monitor is divided into three sections. The programme for development of the intensifier will similarly be divided into three contracts. Each contract will be separate and commitment to one will not imply commitment to following stages. The intensifier development programme is organised as follows. The deliverables are listed against each section with approximate dates. ^&PHASE-A\& Period - Sep 1989 to June 1990 Objectives - To produce an intensifier that shows that the scientific aims of the instrument in terms of sensitivity and resolution can be met. Lifetime will not be proven in this stage and the final design may not be optimal in terms of size, mass and power consumption. This intensifier will form part of the 'Scientific Model' detector. This detector will be used for tests, the results to be compared with those from the competing detector design. Deliverables - - One prototype intensifier (Feb 1990) .br;- Support of following tests with complete detector (Mar-June 90) ^&PHASE-B\& Period - July 1990 to Jan 1992 Objectives - 1.To produce an intensifier of flight design that demonstrates that the full scientific and engineering requirements can be met. This unit will not be qualification tested but will be used in vacuum. 2. To begin a programme that demonstrates that a 10year lifetime can be achieved. This programme may not be completed by the end of the phase. The life testing will be carried out by UCL/MSSL with the support of the contractor. 3. Begin activities to allow timely delivery of items under phase C/D. The intensifier under 1. will form part of the 'Electro-optical Breadboard' (E.O.B.) detector. This will be used as part of the E.O.B. Optical Monitor that will undergo end to end optical tests in vacuum. Deliverables under this phase will be produced according to the XMM-OM product assurance plan. Deliverables - - One E.O.B. intensifier (Mar 1991) .br;- Three intensifiers for use in life testing programme (mid 1991) .br;- Support of following tests with complete detector ^&PHASE-C/D\& Period - Feb 1992 to Dec 1995 Objectives - 1. To produce intensifiers of flight design for qualification programme. Qualification level environmental testing (vibration/thermal vacuum) will be carried out by UCL/MSSL but intensifiers will only be accepted when testing is completed successfully. 2. To produce flight and flight spare intensifiers. Acceptance level environmental testing will be carried out by UCL/MSSL but intensifiers will only be accepted when testing is completed successfully. 3. Complete programme of life testing. Deliverables under this phase will be produced according to the XMM-OM product assurance plan. Deliverables - - Two qualification model intensifiers with supporting documentation (Oct 1992) .br;- Four flight and flight spare intensifiers with supporting documentation (spread over Apr 1994-Oct 1994) .br;- Support of following tests with complete detector (Oct 1994-Dec 1995)